3
LAND, CLIMATE, AND PREHISTORY
and the Tibetan Plateau rose to the heights they have today, with peaks,
such as Mount Everest, reaching almost nine kilometers (or slightly
more than fi ve and a half miles) in height.
The steep drop from these newly created mountains to the (once
island) plains caused rivers to fl ow swiftly down to the seas, cut-
ting deep channels through the plains and depositing the rich silt
and debris that created the alluvial soil of the Indo-Gangetic Plain,
the coastal plains of the Gujarat region, and the river deltas along
the eastern coastline. These same swift-fl owing rivers were unstable,
however, changing course dramatically over the millennia, disappear-
ing in one region and appearing in another. And the places where the
two landmasses collided became geologically unstable also. Today, the
Himalayas continue to rise at the rate of approximately one centime-
ter a year (approximately 10 kilometers every million years), and the
region remains particularly prone to earthquakes.
The subcontinent’s natural borders—mountains and oceans—pro-
tected it. Before modern times, land access to the region for traders,
immigrants, or invaders was possible only through passes in the north-
west ranges: the Bolan Pass leading from the Baluchistan region in mod-
ern Pakistan into Afghanistan and eastern Iran or the more northern
Khyber Pass or Swat Valley, leading into Afghanistan and Central Asia.
These were the great trading highways of the past, connecting India to
both the Near East and Central Asia. In the third millennium
B.C.E. these
routes linked the subcontinent’s earliest civilization with Mesopotamia;
later they were traveled by Alexander the Great (fourth century
B.C.E.);
still later by Buddhist monks, travelers and traders moving north to the
famous Silk Road to China, and in India’s medieval centuries by a range
of Muslim kings and armies. Throughout Indian history a wide range of
traders, migrants, and invaders moved through the harsh mountains and
plateau regions of the north down into the northern plains.
The seas to India’s east, west, and south also protected the subconti-
nent from casual migration or invasion. Here also there were early and
extensive trading contacts: The earliest evidence of trade was between
the Indus River delta on the west coast and the Mesopotamian trad-
ing world (ca. 2600–1900
B.C.E.). Later, during the Roman Empire,
an extensive trade linked the Roman Mediterranean world and both
coasts of India—and even extended further east, to Java, Sumatra, and
Bali. Arab traders took over many of these lucrative trading routes in
the seventh through ninth centuries, and beginning in the 15th cen-
tury European traders established themselves along the Indian coast.
But while the northwest land routes into India were frequently taken
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